Filter-press.



Patentd Jan.20, 1914.

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G. PI STOR, J. DION& H. REITZ, FILTER PRESS.

APPLIUATION FILED AUG. 15, 1912.

1,084,659; Patented Jan. 20,1914

3 SHEETS-SHEET 2.

m a ht a G. PISTOR, J. DIONK H. RBITZ.

I FILTER PRESS. APPLICATION IILEDAUG. 15, 1912.

1,084,659; Patented Jan.20, 1914.

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figural Y partly in section of a press constructed in of a filter press,the plungers of the said GUSTAV PISTOR, JACOB DION, AND HEINRICH REITZ,OF GRIESHEIM-ON-THE-MAIN,

GERMANY, FBANKFORT-ON-THE-MAIN, GERMANY,

.ASSIG-NORS TO CHEMISCI-IE FABRIK-GRIESHEIM-ELEKTRON,

A CORPORATION OF GERMANY.

FILTER-PRESS.

Specification of Letters Patent.

- Patented Jan. 20, 1914.

Application filed August 15, 1912. Serial No. 715,309.

To all whom it may concern:

Be it known that we, Gusmv PIsroR, JAooaDIoN, and HEINRICH Rnrrz, subects of the Emperor of Germany, and residents of Griesheim-on-the-Ma-in,Germany, have invented certain new and useful Improvements inFilter-Presses, of which the following is a specification.

In manufactures, and especially in chemical art manufactures, manysubstances haye to be treated in which the liquid and sol d portionscannot be sufiiciently separated in filter presses, and furthertreatment in hydraulic presses is necessary. Although there is a mode ofworking in which the ,substances are assedfirst through a filter pressand are a erward passed to a hydraulic press tobe'finished, this istroublesome and costly, and there are up to the present but fewconstructions which combine the filter press and the hydraulic press..These constructions have however many disadvantages, such for instanceas great complication, and consequently limited applicability, or thefiltering surface is greatly reduced as compared with an ordinary filterpress.

The arrangement in accordance with the present invention provides acombined filterand hydraulic press, the pressure exerted by which mayamount for example to more than atmospheres, of great simplicity whilethe filtering area ofthe ordinary filter presses is not reduced.

Accordin to this invention, hydraulicpress cylin ers are introducedbetween mem-- bers which are formed like the filter-plates hydraulicpress cylinders subjecting the filter cakes to.any desired highpressure, and in this way further compressing the filter cakes to adegree in accordance with the hydraulic pressure employed.

We will describe with reference to the accompanying drawings, twoconstructions of apparatus in accordance with this invention.

Figure 1 is a view partly in elevation and accordance with the presentinvention; Fi 2 1s a similar view .1 lustratmg a modification; and Fig.3 illustrates a further modification.

Fig. 1 illustrates a press of simple construction consisting of twohead-pieces D covered with half-filter plates C, two chambers l5, andtwo movable plunger parts A.

l ig.,2 shows a modified form. The simple arrangement is doubled ormultiplied and fixed intermediate parts 0, provided on each side withfiltering surfaces fulfil the function of the corresponding head-piecesD and corresponding half filter plates (1.

Moreover movable intermediate pieces B provided on both. sides withfiltering surfaces may be inserted, thereby increasing the number of theactive filtering surfaces and the efiiciency of the press without itbeing necessary to increase the number ofplunger elements. For the samereason the press. plungers may be provided on the side of the 'filtercakes with filtering surfaces.

In the drawings, the hydraulic cylinders are shown without anintermediate wall so that when water is introduced between the plungersboth simultaneously move forward.

If desired, however, these hydraulic cylinders can be provided with anintermediate wall for the. purpose of driving each plunger forwardindependently.

The operation is as follows :Thematerial to be filtered enters throughthe common filling passage F into the chambers E. \Vhen the chambers Eare filled, water under pressure is introduced between the plungers A sothat they move away from each other and force the liquid through thefiltering surfaces L, which may for example be sieves, or cloth, orsieves with cloth. The filtrate runs out through the passage H and thewater, through the passages G which during the compressing operationsare closed by any rupted during the pressin operation by the movementof. the-intermediate pieces B. In the embodiment of the inventionillustrated, this is insured by providing each of the supports for themovable filtering surfaces with a passage leading from the rear of thefilter surface thereon to a channel or groove it that extends laterallyfrom the upppr end of the adjacent outlet II. The channels it which areformed in the inner face of the lower wall of the inclosing casing areeach of such length as to connect the passage II, from which it leads,and the aforesaid passage in the adjacent movable filtering surfacesupport in all positions of the latter, so that each of the passages His in constant communication with the space in rear of the cotiperatingfilter surface, throughout the movement of the plungers or movablepressure plates. After-evacuation, the plungers and intermediate niecesrequire no special adjustment. On filling they are in the closed pressreturned totheir initial position by the pressure of the material to befiltered and the compression begins afresh.

Fig. 3 shows a press of the same construction as Fig. 2, but in whichthe pressure area of the hydraulic plunger is greater than the filteringarea L, By varying the ratio of the areas, it is possible to increase toanydesired amount the specific pressure on the filter cakes even whenthe pressure of the water remains the same.

We claim:

1. In a filter press the combination of two relatively stationary filterplates, two pressure plates arranged between and movable to'and from thefilter plates, and hydraulic the rnoyali e plate iu all positions of themeans for moving the pressure plates apart and toward the filter plates.

2.' In a filter press thc'eombination of tyvo relatively stationaryfiller plates, two additional filter plates arranged between and movableto and from the stationary plates, and means for simultaneously forcingthe movable plates in opposite directions toward the stationary plates.

3. In a filler press, the combination of a relatively stationary filterplate, a second filter plate movable to and from the first.

plate and having a passageextcuding fronr the rear oi? its filteringsurface through its lower faces, and a casing iuclosing said plat andnrovidcd with an outlet. having a brancl extending parallel to thedirection of movemcut of mid movable plate and communicative n'iththefafonr-said passage in latter,

4 in a' lib. r press the (.Ol'llblfltlllOll of a relatii'e ly stationaryfilter plate, a plunger laying ifs face toward said plate provided withafiltering surface, a movable plate betWC'tll the plunger and stationaryfilter plate, having filtering surfaces on both its faces,

and a casing surrounding said parts and provided with passages forsupplying material to be treated to the spaces between the movable plateand the. plunger and stationary plate, respectively, and for receivingliquid passing through all of the filtering surfaces.

' 5 In afilter press the combination of two ward both said plates andprovidedwithfiltering surfaces on thefaces toward said plates, andmovableplates having filtering surfaces on both faces arranged betweeneach of said plungers and the adjacent stationary filter plate.

7. In a filter press, the combination of two relatively stationaryfilter plates, two addi-' tion'al filter plates arranged between thestationary plates, and hydraulic means independent of the materialbetween the stationary and movable plates for moving the latter towardthe stationary plates.

8. In-a filter press, the combination with two relatively stationaryfiltering members, of' pressing means arranged between said filteringmembers and comprising two plates, cachmovable to and from one of saidfiltering members, and means for admitting liquid under pressure betweensaid plates to i ncreasc the distance separating them. 9. In a filterpress, the combination of two relatively movable filter plates, anadditional plate arranged between and movable relative to both saidplates, said intermediate plate having filtering surfaces on both faces,and hydraulic pressure means for effecting relative movement of saidplates.

10. In a filter press, the combination of a relatively stationary filterplate, a hydraulic cylinder, a plunger movable in the cylinder to andfrom said plate and provided with a filtering surface toward said plateand a passage leading from the rear of its filtering surface through itslower face, and a casing inclosing said plate and cylinder and providedwith an outlet that is in communication with said passage in the plungerthroughout the travel of the latter.

11. In a filter press, the combination of a relatively stationary filterplate, a plate movable to and from said stationary plate and providedwith a filter surface toward said stationary plate and a passage leadingfrom the rear of its filtering surface through its lower face, a platearranged between the said stationary and movable plates and providedwith filtering surfaces 0 I with a v essage opening face an through itsfiltering surfaces thereon, 5 closing all of said plates an two outletswhich are re stant communication with the said movable and interme Intestimony 'whereof We have slgne dyin rear of both n both faces andnames to this specification in the irefinee of 1 0 through its lower twosubscribing witnesses.

GUSTAV PISTOR.

J ACOB DION. HEINRICH REITZ.

and a casing 111-.

(1 provided with tively in conassages in diate p ates;

spec

Witnesses:

' ,FRANZ HAssLAcHnR,

d our 'Josnrr WADHOFER.

